Precise measurements of the Q factor of dielectric resonators in the transmission mode-accounting for noise, crosstalk, delay of uncalibrated lines, coupling loss, and coupling reactance

Leong, Kenneth; Mazierska, J.

doi:10.1109/tmtt.2002.802324

Cited by 99 publications

(59 citation statements)

References 12 publications

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“…This method was given in [13][14][15][16] and has been extensively tested through computer simulations. It is clearly explained in [13][14][15][16], so only a brief description of the main processing steps will be given here.…”

Section: Unload Q Measurementmentioning

confidence: 99%

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Patch‐antenna efficiency based on Wheeler cap and measured Q factor

Garcia¹

2003

Micro & Optical Tech Letters

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A new method to determine antenna efficiency, based on the Wheeler cap technique, is presented. It uses the ratio between measured Q factors of the shielded and free‐space antenna impedances as a measure of radiation efficiency. The measured reflection coefficient of the antenna is fitted to an analytical function from which the unloaded Q can be determined. The method is particularized to microstrip patch antennas and is illustrated with simulated and measured results. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 132–142, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11307

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Section: Unload Q Measurementmentioning

confidence: 99%

“…As given in [13][14][15][16], this input data is used to generate the reflection coefficients versus frequency and then the process described in the previous section is used to extract the Q factors and the antenna efficiency. The impedance model considered is the parallel RLC one, as shown in Figure 1(a).…”

Section: Simulationsmentioning

confidence: 99%

Patch‐antenna efficiency based on Wheeler cap and measured Q factor

Garcia¹

2003

Micro & Optical Tech Letters

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“…There are various methods discussed in the literature for measuring Q L factor, e.g., the graphical method, transmission technique, reflection technique, et al [4]. However, some of these methods require sophisticated mathematical treatment or complicated procedures [5] In addition, the 3-dB "three-point" method is used to determine the Q L factor [6]. Usually, the Q L factor is referred as the measured loaded Q L factor of this resonator together with external circuitry and coupling coefficients [6].…”

Section: Introductionmentioning

confidence: 99%

“…However, some of these methods require sophisticated mathematical treatment or complicated procedures [5] In addition, the 3-dB "three-point" method is used to determine the Q L factor [6]. Usually, the Q L factor is referred as the measured loaded Q L factor of this resonator together with external circuitry and coupling coefficients [6]. For an accurate measurement of the Q 0 factor, we need to use very loose coupling between the probe and the resonator to minimize the loading on the resonator.…”

Section: Introductionmentioning

confidence: 99%

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Accurate Extraction of High Quality Factor of Dielectric Resonators From Measurements

Lei¹,

Qiu²,

Zhang³

et al. 2016

PIER Letters

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Abstract-We present a revised Cauchy method to accurately extract the high quality factor of dielectric resonators from measurements. Since the losses displace all the zeros and poles of the transfer function horizontally to the left in the complex plane, the accurate evaluation of the unloaded quality factor of microwave resonators can be achieved based on the complex frequency transformation. The results show that if the three-point method is employed, the accuracy of the quality factor values deteriorates when the input/output coupling is strong. Nevertheless, a nearly constant factor value can be obtained by our proposed technique whether the input/output couplings are weak or strong. This algorithm provides an alternative method to measure the unloaded quality factor when the signal-tonoise ratio is high.

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Q‐Factor Measurements

Luiten

2005

Encyclopedia of RF and Microwave Engineering

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This article presents a review of both traditional and modern methods of Q factor measurement. Many of the techniques to be described were first developed in order to determine the Q factors of resonances falling in the microwave frequency domain. The article commences with a definition of the Q factor and a description of the experimental parameters that need to be measured so as to determine the Q factor of resonance. The various methods for measuring these parameters will then be outlined, including the particular advantages and disadvantages of a technique, the equipment required for the measurement, and its potential for accuracy. Finally, some of the latest developments in the field of Q measurement will be presented.

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Precise measurements of the Q factor of dielectric resonators in the transmission mode-accounting for noise, crosstalk, delay of uncalibrated lines, coupling loss, and coupling reactance

Cited by 99 publications

References 12 publications

Patch‐antenna efficiency based on Wheeler cap and measured Q factor

Patch‐antenna efficiency based on Wheeler cap and measured Q factor

Accurate Extraction of High Quality Factor of Dielectric Resonators From Measurements

Q‐Factor Measurements

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